US143819A

US143819A - Improvement in slide-valve mechanisms

Info

Publication number: US143819A
Authority: US
Publication date: 1873-10-21
Anticipated expiration: 1890-10-21

Description

E. E. GILBERT. Slide-Valve Mechanisms-l No. 143,819,` Patelntedoct.21,1373.Y

' and thence to tubes D2.

` UNITED STATES.:

PA'IENT OFFIcE.

EBENEZEB E. GILBERT, OF MONTREAL, CANADA.

IMPROVEMENT IN SLIDE-VALVE MECHANISMS.

Specication forming part of Letters Patent No. 143,819, dated October 21, 1873; application led May 10, 1873.

To all whom it may concern:

, Be it known that I, EEENEZER E. GILBERT,

l my improved valve mechanism attached.

The invention consists in the improvement of valve mechanism for steamengines, as hereinafter described, and pointed out in the claim.

A represents a steam-cylinder, having a piston, B, steam inlet and outlet ports m fm', and exhaust W. C is the main slide-valve, which has end tubes D2 that slide upon the close-tting guide-rods D1 Dl. These guiderods have rear iianges, d, that hold them movably between4 guide-brackets b. When the friction between the valve C and its seat creates wear, the valve is thus enabled to lower itself and automatically take up the wear.

As the reciprocation of the valve upon its guide-rods is liable to be attended with a clap` ping and disagreeable noise, it has been quite Y an object to prevent this, if possible.

I have accomplished this object by the use of an auxiliary valve, E, peculiarly constructed, and ar- -ranged in the steam-chest p and over the main valve. This valve E has two subjacent cavities, e e, which alternately connect with the exhaust W by a vertical passage, g, and are separated by a partition, c1. ff are the ports, through which steam passes into and out of the tubes D2, to alternately force the main valve C in opposite directions, while ff' are recesses, over which pass thc ends of the valve E, to admit steam into chambers el e, My object is to cut oi the egress of steam from these cylinders in time to form a cushion, to prevent their percussive impact upon the rods D1. For that purpose the exhaust-passage gis s o locally arit with two upward projections, e2 e2, between which works loosely a free end of the crankarm Vh of the rock-shaft K, which is connected by a pitman, k, to the reciprocating rod of the piston B. By this means the auxiliary valve becomes automatically adjustable by its own gravity, both as respects its own wear and that of the main valve.

My novel mode of constructing and arranging my auxiliary valve upon the main one embodies the following jlhode of operation: As shown in Fig. l of the drawing, the valve E has begun to admit steam to the chamber e; but just before this has occurred the partition e1 has covered the passage g, thus cutting o the escape of a portionzof the steam in tube D2, and forming a cushion against the rod D1. p

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with main valve C, having end tubes D2, of guide-rods D1, having iianges d arranged loosely in brackets b, as

and for the purpose described.y

2. The auxiliary slide valve E, having the subjacent cavities e e and vpartition e1, combined with the main slide-valve C, having passage g, end recesses f f', and tubes D2 with passages f, as and for the purpose set forth. EBENEZER EDWIN GILBERT.

Witnesses:

GEORG-E O. MoFFAT'r, VJOHN G. GRIFFIN.